<?php

/**
 * @package dompdf
 * @link    http://www.dompdf.com/
 * @author  Benj Carson <benjcarson@digitaljunkies.ca>
 * @author  Brian Sweeney <eclecticgeek@gmail.com>
 * @author  Fabien M�nager <fabien.menager@gmail.com>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 * @version $Id: text_frame_decorator.cls.php 459 2012-01-25 21:38:50Z fabien.menager $
 */

/**
 * Decorates Frame objects for text layout
 *
 * @access private
 * @package dompdf
 */
class Text_Frame_Decorator extends Frame_Decorator {

    // protected members
    protected $_text_spacing;
    // buggy DOMText::splitText (PHP < 5.2.7)
    public static $_buggy_splittext;

    function __construct(Frame $frame, DOMPDF $dompdf) {
        if (!$frame->is_text_node())
            throw new DOMPDF_Exception("Text_Decorator can only be applied to #text nodes.");

        parent::__construct($frame, $dompdf);
        $this->_text_spacing = null;
    }

    //........................................................................

    function reset() {
        parent::reset();
        $this->_text_spacing = null;
    }

    //........................................................................
    // Accessor methods
    function get_text_spacing() {
        return $this->_text_spacing;
    }

    function get_text() {
        // FIXME: this should be in a child class (and is incorrect)
//    if ( $this->_frame->get_style()->content !== "normal" ) {
//      $this->_frame->get_node()->data = $this->_frame->get_style()->content;
//      $this->_frame->get_style()->content = "normal";
//    }
//      pre_r("---");
//      $style = $this->_frame->get_style();
//      var_dump($text = $this->_frame->get_node()->data);
//      var_dump($asc = utf8_decode($text));
//      for ($i = 0; $i < strlen($asc); $i++)
//        pre_r("$i: " . $asc[$i] . " - " . ord($asc[$i]));
//      pre_r("width: " . Font_Metrics::get_text_width($text, $style->font_family, $style->font_size));

        return $this->_frame->get_node()->data;
    }

    //........................................................................
    // Vertical margins & padding do not apply to text frames
    // http://www.w3.org/TR/CSS21/visudet.html#inline-non-replaced:
    //
  // The vertical padding, border and margin of an inline, non-replaced box
    // start at the top and bottom of the content area, not the
    // 'line-height'. But only the 'line-height' is used to calculate the
    // height of the line box.
    function get_margin_height() {
        // This function is called in add_frame_to_line() and is used to
        // determine the line height, so we actually want to return the
        // 'line-height' property, not the actual margin box
        $style = $this->get_style();
        $font = $style->font_family;
        $size = $style->font_size;

        /*
          pre_r('-----');
          pre_r($style->line_height);
          pre_r($style->font_size);
          pre_r(Font_Metrics::get_font_height($font, $size));
          pre_r(($style->line_height / $size) * Font_Metrics::get_font_height($font, $size));
         */

        return ($style->line_height / $size) * Font_Metrics::get_font_height($font, $size);
    }

    function get_padding_box() {
        $pb = $this->_frame->get_padding_box();
        $pb[3] = $pb["h"] = $this->_frame->get_style()->height;
        return $pb;
    }

    //........................................................................
    // Set method
    function set_text_spacing($spacing) {
        $style = $this->_frame->get_style();

        $this->_text_spacing = $spacing;
        $char_spacing = $style->length_in_pt($style->letter_spacing);

        // Re-adjust our width to account for the change in spacing
        $style->width = Font_Metrics::get_text_width($this->get_text(), $style->font_family, $style->font_size, $spacing, $char_spacing);
    }

    //........................................................................
    // Recalculate the text width
    function recalculate_width() {
        $style = $this->get_style();
        $text = $this->get_text();
        $size = $style->font_size;
        $font = $style->font_family;
        $word_spacing = $style->length_in_pt($style->word_spacing);
        $char_spacing = $style->length_in_pt($style->letter_spacing);

        return $style->width = Font_Metrics::get_text_width($text, $font, $size, $word_spacing, $char_spacing);
    }

    //........................................................................
    // Text manipulation methods
    // split the text in this frame at the offset specified.  The remaining
    // text is added a sibling frame following this one and is returned.
    function split_text($offset) {
        if ($offset == 0)
            return;

        if (self::$_buggy_splittext) {
            // workaround to solve DOMText::spliText() bug parsing multibyte strings
            $node = $this->_frame->get_node();
            $txt0 = $node->substringData(0, $offset);
            $txt1 = $node->substringData($offset, mb_strlen($node->textContent) - 1);

            $node->replaceData(0, mb_strlen($node->textContent), $txt0);
            $split = $node->parentNode->appendChild(new DOMText($txt1));
        } else {
            $split = $this->_frame->get_node()->splitText($offset);
        }

        $deco = $this->copy($split);

        $p = $this->get_parent();
        $p->insert_child_after($deco, $this, false);

        if ($p instanceof Inline_Frame_Decorator)
            $p->split($deco);

        return $deco;
    }

    //........................................................................

    function delete_text($offset, $count) {
        $this->_frame->get_node()->deleteData($offset, $count);
    }

    //........................................................................

    function set_text($text) {
        $this->_frame->get_node()->data = $text;
    }

}

Text_Frame_Decorator::$_buggy_splittext = PHP_VERSION_ID < 50207;
